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General rule of thumb for StraightTalk Sim card choices.
AT&T = Larger Network, better building penetration of signal, but slower data speeds.
T-Mobile = Only in large cities, less building penetration, faster speeds than LTE if you are in an HSPA+42 area.
No one is really sure why ST is no longer offering AT&T cards or even mentioning AT&T though some have speculated they are negotiating with AT&T and this is a negotiating tactic.
I can tell you they haven't stopped AT&T service or anything as I'm currently using an AT&T card and my service is still working just fine.